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From: tainter@ihlpg.UUCP (Tainter)
Newsgroups: net.micro.atari16
Subject: Re: bidirectional ST printer port
Message-ID: <1747@ihlpg.UUCP>
Date: Mon, 31-Mar-86 10:27:50 EST
Article-I.D.: ihlpg.1747
Posted: Mon Mar 31 10:27:50 1986
Date-Received: Wed, 2-Apr-86 01:46:55 EST
References: <8603270456.AA05025@ucbvax.berkeley.edu>
Organization: AT&T Bell Laboratories
Lines: 14

> I was hoping that the ST printer port was bidirectional, but I have seen
> no documentation for it.  The ST manual shows only one set of data pins
> on the printer socket, and the developer's kit only talks about writing
> to the printer, not reading from it.  So:
> 
> What are the pins on the printer socket for doing input to the ST?
> What does the software interface look like?  Is it the obvious thing
> (using one of the BIOS input routines with the the printer device)?
> 
> 	Dan Franklin

The printer port is a bidirectional parallel port.  That means the same pins
used for output are used for input.  The software interface is the BIOS
input routines with device parameters as you suspected.